For anyone taking Zoloft, what is the average of what people take. I was on 50 mgs for a few years, then was upped to 100 mgs, and recently upped to 100 mgs, in the morning and 50 mgs at supper time. I have not yet started taking the 50 mgs at supper as I feel I felt fine before on 50, why do I have to keep upping it?